--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: exresolv - AML Interpreter object resolution
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "amlcode.h"
+#include "acdispat.h"
+#include "acinterp.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_EXECUTER
+ACPI_MODULE_NAME("exresolv")
+
+/* Local prototypes */
+static acpi_status
+acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
+ struct acpi_walk_state *walk_state);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_resolve_to_value
+ *
+ * PARAMETERS: **stack_ptr - Points to entry on obj_stack, which can
+ * be either an (union acpi_operand_object *)
+ * or an acpi_handle.
+ * walk_state - Current method state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Convert Reference objects to values
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_resolve_to_value(union acpi_operand_object **stack_ptr,
+ struct acpi_walk_state *walk_state)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_resolve_to_value, stack_ptr);
+
+ if (!stack_ptr || !*stack_ptr) {
+ ACPI_ERROR((AE_INFO, "Internal - null pointer"));
+ return_ACPI_STATUS(AE_AML_NO_OPERAND);
+ }
+
+ /*
+ * The entity pointed to by the stack_ptr can be either
+ * 1) A valid union acpi_operand_object, or
+ * 2) A struct acpi_namespace_node (named_obj)
+ */
+ if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_OPERAND) {
+ status = acpi_ex_resolve_object_to_value(stack_ptr, walk_state);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ if (!*stack_ptr) {
+ ACPI_ERROR((AE_INFO, "Internal - null pointer"));
+ return_ACPI_STATUS(AE_AML_NO_OPERAND);
+ }
+ }
+
+ /*
+ * Object on the stack may have changed if acpi_ex_resolve_object_to_value()
+ * was called (i.e., we can't use an _else_ here.)
+ */
+ if (ACPI_GET_DESCRIPTOR_TYPE(*stack_ptr) == ACPI_DESC_TYPE_NAMED) {
+ status =
+ acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR
+ (struct acpi_namespace_node,
+ stack_ptr), walk_state);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Resolved object %p\n", *stack_ptr));
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_resolve_object_to_value
+ *
+ * PARAMETERS: stack_ptr - Pointer to an internal object
+ * walk_state - Current method state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Retrieve the value from an internal object. The Reference type
+ * uses the associated AML opcode to determine the value.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_resolve_object_to_value(union acpi_operand_object **stack_ptr,
+ struct acpi_walk_state *walk_state)
+{
+ acpi_status status = AE_OK;
+ union acpi_operand_object *stack_desc;
+ union acpi_operand_object *obj_desc = NULL;
+ u8 ref_type;
+
+ ACPI_FUNCTION_TRACE(ex_resolve_object_to_value);
+
+ stack_desc = *stack_ptr;
+
+ /* This is an object of type union acpi_operand_object */
+
+ switch (stack_desc->common.type) {
+ case ACPI_TYPE_LOCAL_REFERENCE:
+
+ ref_type = stack_desc->reference.class;
+
+ switch (ref_type) {
+ case ACPI_REFCLASS_LOCAL:
+ case ACPI_REFCLASS_ARG:
+ /*
+ * Get the local from the method's state info
+ * Note: this increments the local's object reference count
+ */
+ status = acpi_ds_method_data_get_value(ref_type,
+ stack_desc->
+ reference.value,
+ walk_state,
+ &obj_desc);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "[Arg/Local %X] ValueObj is %p\n",
+ stack_desc->reference.value,
+ obj_desc));
+
+ /*
+ * Now we can delete the original Reference Object and
+ * replace it with the resolved value
+ */
+ acpi_ut_remove_reference(stack_desc);
+ *stack_ptr = obj_desc;
+ break;
+
+ case ACPI_REFCLASS_INDEX:
+
+ switch (stack_desc->reference.target_type) {
+ case ACPI_TYPE_BUFFER_FIELD:
+
+ /* Just return - do not dereference */
+ break;
+
+ case ACPI_TYPE_PACKAGE:
+
+ /* If method call or copy_object - do not dereference */
+
+ if ((walk_state->opcode ==
+ AML_INT_METHODCALL_OP)
+ || (walk_state->opcode == AML_COPY_OP)) {
+ break;
+ }
+
+ /* Otherwise, dereference the package_index to a package element */
+
+ obj_desc = *stack_desc->reference.where;
+ if (obj_desc) {
+ /*
+ * Valid object descriptor, copy pointer to return value
+ * (i.e., dereference the package index)
+ * Delete the ref object, increment the returned object
+ */
+ acpi_ut_remove_reference(stack_desc);
+ acpi_ut_add_reference(obj_desc);
+ *stack_ptr = obj_desc;
+ } else {
+ /*
+ * A NULL object descriptor means an uninitialized element of
+ * the package, can't dereference it
+ */
+ ACPI_ERROR((AE_INFO,
+ "Attempt to dereference an Index to NULL package element Idx=%p",
+ stack_desc));
+ status = AE_AML_UNINITIALIZED_ELEMENT;
+ }
+ break;
+
+ default:
+
+ /* Invalid reference object */
+
+ ACPI_ERROR((AE_INFO,
+ "Unknown TargetType 0x%X in Index/Reference object %p",
+ stack_desc->reference.target_type,
+ stack_desc));
+ status = AE_AML_INTERNAL;
+ break;
+ }
+ break;
+
+ case ACPI_REFCLASS_REFOF:
+ case ACPI_REFCLASS_DEBUG:
+ case ACPI_REFCLASS_TABLE:
+
+ /* Just leave the object as-is, do not dereference */
+
+ break;
+
+ case ACPI_REFCLASS_NAME: /* Reference to a named object */
+
+ /* Dereference the name */
+
+ if ((stack_desc->reference.node->type ==
+ ACPI_TYPE_DEVICE)
+ || (stack_desc->reference.node->type ==
+ ACPI_TYPE_THERMAL)) {
+
+ /* These node types do not have 'real' subobjects */
+
+ *stack_ptr = (void *)stack_desc->reference.node;
+ } else {
+ /* Get the object pointed to by the namespace node */
+
+ *stack_ptr =
+ (stack_desc->reference.node)->object;
+ acpi_ut_add_reference(*stack_ptr);
+ }
+
+ acpi_ut_remove_reference(stack_desc);
+ break;
+
+ default:
+
+ ACPI_ERROR((AE_INFO,
+ "Unknown Reference type 0x%X in %p",
+ ref_type, stack_desc));
+ status = AE_AML_INTERNAL;
+ break;
+ }
+ break;
+
+ case ACPI_TYPE_BUFFER:
+
+ status = acpi_ds_get_buffer_arguments(stack_desc);
+ break;
+
+ case ACPI_TYPE_PACKAGE:
+
+ status = acpi_ds_get_package_arguments(stack_desc);
+ break;
+
+ case ACPI_TYPE_BUFFER_FIELD:
+ case ACPI_TYPE_LOCAL_REGION_FIELD:
+ case ACPI_TYPE_LOCAL_BANK_FIELD:
+ case ACPI_TYPE_LOCAL_INDEX_FIELD:
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "FieldRead SourceDesc=%p Type=%X\n",
+ stack_desc, stack_desc->common.type));
+
+ status =
+ acpi_ex_read_data_from_field(walk_state, stack_desc,
+ &obj_desc);
+
+ /* Remove a reference to the original operand, then override */
+
+ acpi_ut_remove_reference(*stack_ptr);
+ *stack_ptr = (void *)obj_desc;
+ break;
+
+ default:
+
+ break;
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_resolve_multiple
+ *
+ * PARAMETERS: walk_state - Current state (contains AML opcode)
+ * operand - Starting point for resolution
+ * return_type - Where the object type is returned
+ * return_desc - Where the resolved object is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Return the base object and type. Traverse a reference list if
+ * necessary to get to the base object.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_resolve_multiple(struct acpi_walk_state *walk_state,
+ union acpi_operand_object *operand,
+ acpi_object_type * return_type,
+ union acpi_operand_object **return_desc)
+{
+ union acpi_operand_object *obj_desc = (void *)operand;
+ struct acpi_namespace_node *node;
+ acpi_object_type type;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_ex_resolve_multiple);
+
+ /* Operand can be either a namespace node or an operand descriptor */
+
+ switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
+ case ACPI_DESC_TYPE_OPERAND:
+
+ type = obj_desc->common.type;
+ break;
+
+ case ACPI_DESC_TYPE_NAMED:
+
+ type = ((struct acpi_namespace_node *)obj_desc)->type;
+ obj_desc =
+ acpi_ns_get_attached_object((struct acpi_namespace_node *)
+ obj_desc);
+
+ /* If we had an Alias node, use the attached object for type info */
+
+ if (type == ACPI_TYPE_LOCAL_ALIAS) {
+ type = ((struct acpi_namespace_node *)obj_desc)->type;
+ obj_desc =
+ acpi_ns_get_attached_object((struct
+ acpi_namespace_node *)
+ obj_desc);
+ }
+ break;
+
+ default:
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /* If type is anything other than a reference, we are done */
+
+ if (type != ACPI_TYPE_LOCAL_REFERENCE) {
+ goto exit;
+ }
+
+ /*
+ * For reference objects created via the ref_of, Index, or Load/load_table
+ * operators, we need to get to the base object (as per the ACPI
+ * specification of the object_type and size_of operators). This means
+ * traversing the list of possibly many nested references.
+ */
+ while (obj_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
+ switch (obj_desc->reference.class) {
+ case ACPI_REFCLASS_REFOF:
+ case ACPI_REFCLASS_NAME:
+
+ /* Dereference the reference pointer */
+
+ if (obj_desc->reference.class == ACPI_REFCLASS_REFOF) {
+ node = obj_desc->reference.object;
+ } else { /* AML_INT_NAMEPATH_OP */
+
+ node = obj_desc->reference.node;
+ }
+
+ /* All "References" point to a NS node */
+
+ if (ACPI_GET_DESCRIPTOR_TYPE(node) !=
+ ACPI_DESC_TYPE_NAMED) {
+ ACPI_ERROR((AE_INFO,
+ "Not a namespace node %p [%s]",
+ node,
+ acpi_ut_get_descriptor_name(node)));
+ return_ACPI_STATUS(AE_AML_INTERNAL);
+ }
+
+ /* Get the attached object */
+
+ obj_desc = acpi_ns_get_attached_object(node);
+ if (!obj_desc) {
+
+ /* No object, use the NS node type */
+
+ type = acpi_ns_get_type(node);
+ goto exit;
+ }
+
+ /* Check for circular references */
+
+ if (obj_desc == operand) {
+ return_ACPI_STATUS(AE_AML_CIRCULAR_REFERENCE);
+ }
+ break;
+
+ case ACPI_REFCLASS_INDEX:
+
+ /* Get the type of this reference (index into another object) */
+
+ type = obj_desc->reference.target_type;
+ if (type != ACPI_TYPE_PACKAGE) {
+ goto exit;
+ }
+
+ /*
+ * The main object is a package, we want to get the type
+ * of the individual package element that is referenced by
+ * the index.
+ *
+ * This could of course in turn be another reference object.
+ */
+ obj_desc = *(obj_desc->reference.where);
+ if (!obj_desc) {
+
+ /* NULL package elements are allowed */
+
+ type = 0; /* Uninitialized */
+ goto exit;
+ }
+ break;
+
+ case ACPI_REFCLASS_TABLE:
+
+ type = ACPI_TYPE_DDB_HANDLE;
+ goto exit;
+
+ case ACPI_REFCLASS_LOCAL:
+ case ACPI_REFCLASS_ARG:
+
+ if (return_desc) {
+ status =
+ acpi_ds_method_data_get_value(obj_desc->
+ reference.
+ class,
+ obj_desc->
+ reference.
+ value,
+ walk_state,
+ &obj_desc);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ acpi_ut_remove_reference(obj_desc);
+ } else {
+ status =
+ acpi_ds_method_data_get_node(obj_desc->
+ reference.
+ class,
+ obj_desc->
+ reference.
+ value,
+ walk_state,
+ &node);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ obj_desc = acpi_ns_get_attached_object(node);
+ if (!obj_desc) {
+ type = ACPI_TYPE_ANY;
+ goto exit;
+ }
+ }
+ break;
+
+ case ACPI_REFCLASS_DEBUG:
+
+ /* The Debug Object is of type "DebugObject" */
+
+ type = ACPI_TYPE_DEBUG_OBJECT;
+ goto exit;
+
+ default:
+
+ ACPI_ERROR((AE_INFO,
+ "Unknown Reference Class 0x%2.2X",
+ obj_desc->reference.class));
+ return_ACPI_STATUS(AE_AML_INTERNAL);
+ }
+ }
+
+ /*
+ * Now we are guaranteed to have an object that has not been created
+ * via the ref_of or Index operators.
+ */
+ type = obj_desc->common.type;
+
+exit:
+ /* Convert internal types to external types */
+
+ switch (type) {
+ case ACPI_TYPE_LOCAL_REGION_FIELD:
+ case ACPI_TYPE_LOCAL_BANK_FIELD:
+ case ACPI_TYPE_LOCAL_INDEX_FIELD:
+
+ type = ACPI_TYPE_FIELD_UNIT;
+ break;
+
+ case ACPI_TYPE_LOCAL_SCOPE:
+
+ /* Per ACPI Specification, Scope is untyped */
+
+ type = ACPI_TYPE_ANY;
+ break;
+
+ default:
+
+ /* No change to Type required */
+
+ break;
+ }
+
+ *return_type = type;
+ if (return_desc) {
+ *return_desc = obj_desc;
+ }
+ return_ACPI_STATUS(AE_OK);
+}
Code Review / kvmfornfv.git / blobdiff